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Momentum-Resolved Evolution of the Kondo Lattice into ''Hidden Order'' in URu2Si2

F. L. Boariu C. Bareille 1 H. Schwab A. Nuber P. Lejay 2 T. Durakiewicz F. Reinert A. F. Santander-Syro 1 
CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, CSNSM - Centre de Sciences Nucléaires et de Sciences de la Matière
2 CrisMass - Cristaux Massifs
NEEL - Institut Néel
Abstract : We study, using high-resolution angle-resolved photoemission spectroscopy, the evolution of the electronic structure in URu2Si2 at the Γ, Z, and X high-symmetry points from the high-temperature Kondo-screened regime to the low-temperature hidden-order (HO) state. At all temperatures and symmetry points, we find structures resulting from the interaction between heavy and light bands related to the Kondo-lattice formation. At the X point, we directly measure a hybridization gap of 11 meV already open at temperatures above the ordered phase. Strikingly, we find that while the HO induces pronounced changes at Γ and Z, the hybridization gap at X does not change, indicating that the hidden-order parameter is anisotropic. Furthermore, at the Γ and Z points, we observe the opening of a gap in momentum in the HO state, and show that the associated electronic structure results from the hybridization of a light electron band with the Kondo-lattice bands characterizing the paramagnetic state.
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Submitted on : Monday, August 19, 2013 - 3:12:25 PM
Last modification on : Sunday, June 26, 2022 - 11:59:29 AM

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F. L. Boariu, C. Bareille, H. Schwab, A. Nuber, P. Lejay, et al.. Momentum-Resolved Evolution of the Kondo Lattice into ''Hidden Order'' in URu2Si2. Physical Review Letters, American Physical Society, 2013, 110, pp.156404. ⟨10.1103/PHYSREVLETT.110.156404⟩. ⟨in2p3-00851999⟩



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